Slip jacket and method of making it



April 28 1925. 1,535,343

E. P. ROTHACKER SLIP JACKET AND METHOD OF MAKING IT Filed Jan 14, 1920 3Shee'tS-Sheet l ank-: 7.

April 28, 1925.

, 1,535,343 E. P. ROTHACKER 'SLIP JACKET AND METHOD OF MAKING IT 5Sheets-Sheei 2 Filed Jan. 14, 1920 fDWAED PEorHAC/rm April 23, 1925.1,535,343

E. P. ROTHACKER SLIP JACKET AND METHOD OF MAKING IT Filed Jan. 14, 19203 Sheets-Sheet s i Patented Apr. 28, 1925.

UNITED S TATES PATENT OFFICE- iEDWARD I. .ROTI-IAGKER, OF GLEVEL'AND,OHIO.

SLIIJACKET IAND METHOD OF MAKING- .IT.

Application filed January 14, 1920. Serial-No. 351,447.

To all whom-'itrmag concern Be it known that I, 1 EDWARD P. Ro'rrrAomER, a citizen of the "United States, residing i which "have contemplatedapplying '.that j principle iso "as-to distinguish it from otherinventions.

invention relatesboth to .a'slip jacket *for foundry use andto the.methodo'f casting the same.

Slipja'ckets are usedtorepla'ce a flask to confine a finished mold untiland during the "time when'metal is to'be poured into the mold. Slipjackets being lessexpensivethan "flasks are employed to enable prompt.reuse 'o' fthefias'k inthe preparationo'f duplicate 'moltls. Slip*ja'ckets may have either straight or sloping sides and have heretoiore,been of composite construction usually comprising steel plates welded orotherwise secured together "at the corners.

Experience has demonstrated however, that "slip jackts so constructedbecome warped.

*I propose the "manufacture of slip jackets cast in one'piece,mindfuljofthe iact that castiron*holdsitsishape regardless of alternate heatingand cooling. 7 It is essential thatthe walls of a slip jacketbe smoothand precisely 'iormedin' orderth'at equisized jackets may beinterchangeable and 'to insure against the sand bulging out over evenrelatively 5 small areas during the "pouring operation. Besides the"factor of economy, it is manifest that minimum weightis an "advantage,'and'I have discovered that the thickness of cast ironislip jackets neednot exceed three sixteenths of an inch.;

I have provided the sides of my slip jacket with means whereby "woodenhandles may 'be detachably connected, wood being (it good insulation"against heat and (due to its "cheapness may bei'frequently replaced,This feature er my invention l b'elievetobe patentably novel. I"Knownioundry*praetice does not enable the successful'productionof castslip jackets because oithe impossibility of withdrawing the pattern ifth'esantl is packed "on both sidesbffthe latter inthe same mold,andbecause ="a least su j a ket cannot reliably "be niade with ascorewhichwould become dise torted in shape. Exceptior the handle lugs,

in'prepar'ing the mold accordingto my invention,'Ie1nploy only greensand. vAnother seeming obstacle which I have overcome is to makepossible the insertion of a gate pattern because, as those skilled inthe art will readily discern, a uniform feeding and spread of metal tothe mold cavity is desirable'if not indeed necessary.

This application is to be considered, in respect to all contimon subjectmatter, a continuation of my earlier application filed May 12, 1919,Serial No. 296,697.

Adverting to the drawings Figure I is atop plan view of cast metal slipjacket embodying. my invention, a sug 'gested shape of gate beingindicatedin dotted'lines.

Figure II is a'sideelevation of the same. Figure III is a sectional viewshowingthe jacket in place around a mold. Figure IVis aibottom plan viewof my design forxslip jacket, likewise showing in dotted lines asuggested form of gate.

Figure V is a plan view of the pattern of fthe'drag withthejpattern ofthe lower gate .in place.

.Figure VIlis a section onlline VIP-VI of Figure V with the flask'forthe drag side surmounted thereon.

moved from its mold and also showing a simplesprue. V

Figure VIII is a plan'view of the cope pattern with the pattern oftheupper gate in place.

FigureIX is a section through a corefor making a handle retaining lugson the jacket;

Figure X is a section on line XX of Figure VIII with the flask for thecope side inverted upon a follow board.

Figure IXI is a median section of the completed mold.

vThe illustrated slip jacket consists of a four sided frame 1 providedon each of oppositely disposed sides with a pair of lugs 2 forming ad0ve tailed channel for the insertion of wooden handles 3. It should beunderstood that the handles 3 are removably fitted in place so thatwhenever they become over charred or burned they may be removed andreplaced with new ones. In Figure III the slip jacket is shown em FigureVII is a similar View showing the drag turned over and the ,drag patternrebracing a mold 4 including a cavity 5 to which a sprue 6 leads.

The method of casting a slip jacket of thin light construction and ofuniform thickness proved to be a problem the solution of which I willnow describe.

A hollow box or female pattern 7 is provided with a cavity 8 which isopen above' as shown in Figure VT. The pattern 7 carries on oppositesides angle irons 9 provided with holes 10. After filling the cavity 8with sand and suitably packing the same level with the upper surface 11of the pattern, I lay thereon a gate pattern having the shape shown inFigures IV and V. It will be understood that the shape of the gatepattern 12 may be varied provided it enables the metal to spreaduniformly toward the sides. A flask 13 stiffened by cross bars 14carries on opposite sides angle irons 15 provided with pins 16. As iscommon practice, the pins 16 are adapted for insertion in the holes 10to hold the flask in its proper surmounted position. Next the flask 18is filled and rammed up with sand 17 thereby, of course enclosing thegate pattern 12. The flask 13 for the drag side is then lifted to enablethe gate pattern 12 to be drawn and removed. Then a sprue 18 is cut.Thereupon the flask 13 is again placed over the pattern 7 and bothmembers inverted in the usual manner upon a floor. Next the form pattern7 is lifted away from the sand form 19 which occupied the cavity 8, asappears in Figure VII.

Another flask 20 provided with lateral irons 21 having holes 22 is.similarly stiffened. by bars 23. The flask 20 is to be mounted upon afollow board 24 provided with angle irons 25 which carry pins 26. Ablock or male pattern 27 is fastened to the upper side of the followboard 24 by means of screws Two oppositely disposed sides of the pattern27 are fashioned each with a pair of inclined core prints 29 toeventually produce cavities for the reception of four cores 30 providedwith interiorly open cut-outs 31 separated by a core section 32. Suchcore is shown in Figure IX and is shaped to enable the formation of thetwo lugs 2 as will be readily understood by those skilled in the art.Carried upon the top of the pattern 27 integrally or detachably is agate pattern 33 of the same shape as the gate pattern 12. After theflask 20 is fitted upon the follow board 24 so as to enclose patterns 27and 33 as appears in Figure X, it is filled with sand and suitablypacked. Then a central sprue is cut down to the pattern 33, after whichthe flask 20 and follow board 24. are together inverted upon anotherboard or floor not shown. Following this, the screws 28 are removed, thefollow board 2 L removed and the patterns 27 and 33 drawn after havingbeen previously rapped. It is at this stage, that the four cores 30 areplaced in the core print cavities left after the withdrawal of the coreprints 29. The flask 20 for the cope'side is now again inverted andplaced over the flask 13 for the drag side, the pins 16 of the latterpassing through the holes 22 of the former, in which position the sprue3st is directly over or in registry with the sprue 18 and the moldcompleted as appears in Figure XI. The mold will be seen to include acavity 35 for the upper gate, a cavity 36 for the lower gate and acavity 37 for the slip jacket casting.

I claim:

1. The method of casting a slip jacket which consists in making a malesand. mold section, fashioning the top of a larger female sand mold withgate sprue, and cutting a sprue through said female sand mold to causeit to communicate with said gate sprue. and introducing molten metal tosaid sprues.

2. The method of casting a slip jacket which consists in making a femalesand mold section, fashioning the bottom of a smaller male sand moldwith gate sprue, and cutting sprues through both male and female sandmolds to cause them to communicate with said gate sprue, and introducingmolten metal to said sprues.

3. The method of making a slip jacket which consists in filling a boxpattern with sand, enclosing with sand a block pattern larger than theinterior of said box pattern, removing said patterns, bringing said moldportions into juxtaposition, and causing molten metal to flow bothupwardly and downwardly around said mold.

41.. The method of making a slip jacket which consists in superimposinga flask upon a box pattern, filling both pattern and flask with sandplacing a block pattern larger than the interior of said box patternupon follow board, enclosing said block pattern by laying a flask uponsaid follow board, filling said flask with sand, inverting both tl asksand molds leading sprues to each mold ivity withdrawing said patterns,replacing the block mold cavity over the box mold cavity to effect aregistry of said sprues and causing molten metal simultaneously to flowthrough said sprues.

5. The method of making a slip jacket which consists in superimposing aflask upon a box pattern, filling both pattern and flask with sand,cutting a sprue, enclosing with sand a block pattern larger than theinterior of said box pattern, cutting a sprue. removing said patterns,bringing said mold portions into juxtaposition so that said spruesregister, and causing molten metal to flow around said mold upwardlyfrom the bottom of one sprue and downwardly from the-bottom of the othersprue.

6. The method of casting a slip jacket "which consists in straddling theupper open messa e laying a flask for the cope sidewupoma foL that saidflask encloses said patterns filling said cope flask with sand,inverting, draw ing. the. patterns "and covering: the drag supportedmold with the cope supported cavity.

7. The method of casting a slip jacket which consists in laying a gatepattern across the top of an open box pattern, covering with a flask forthe drag side, packing opposite sides of said gate pattern with sand,inverting the parts, cutting a sprue, lifting the box pattern, laying aflask for the cope side upon a follow board which detachably carries ablock pattern and surmounted gate pattern so that said flask enclosessaid patterns filling said cope flask with sand, inverting, cutting asprue, draw ing the patterns, covering the drag supported mold with thecope supported cavity, and pouring molten metal simultaneously throughsaid sprues.

8. The method of casting a slip jacket which consists in filling afemale pattern with sand laying a gate pattern thereon, covering with aflask for the drag side, packing said drag flask with sand, cutting acentral sprue to said gate pattern, lifting the drag flask, removing thegate pattern,

replacing the drag flask upon the female pattern, inverting, lifting offthe female pattern, laying a flask for the cope side upon a follow boardwhich detachably carries a male pattern and surmounted gate patternfilling said cope flask with sand, inverting, cutting a central sprue tosaid gate pattern, drawing the female patterns, covering the dragsupported mold with the cope supported cavity to bring said sprues intoregistry, and pouring molten metal simultaneously through said spruesand to all sides of said mold cavity along said gate cavitiesrespectively.

9. A slip jacket provided on opposite sides with laterally extendingslots, and handles detachably insertible into said slots.

10. The method of molding which consists in fashioning a main moldcavity with a core print cavity and inserting into said core print acore having cut-outs so that the latter communicate with said main moldcavity, said cut-outs enclosing a dovetail shaped core section.

ll. The herein described method of molding which consists in making alooped or endless mold cavity and a core cavity communicating therewith,inserting in said core cavity a hollowed core opening into the loopedcavity and causing molten metal simultaneously to flow around saidlooped cavity in itb'oth wdirectibns to fill the core hollows. U

1 2. "The z-method of inaking a slip jat'ket which consists in %bringingmale. and female sand; po1tions ti nto' juxtaposition, and caus- "l0 ingimolten metal to Tfiow bothmpwardly and "downwardly around said mold.

i=3. The method of making a su j acket svl lich cons-ists insuper-impo'siing a flask over :a box i pattern :and a surmounted ga'tepattern, filling with sand, cutting a central sprue, enclosing with sanda gate pattern and a block pattern larger than the interior of said boxpattern, cutting a central sprue, removing said patterns, bringing saidmold portions into .justaposition so that said vsprues register, andintroducing molten metal to cause it to flow through both central spruesand through said gate sprues and around said mold upwardly from thebottom of one sprue and downwardly from the bottom of the other sprue.

14. The method of casting a slip jacket which consists in straddling theupper open side of a box pattern with a gate pattern, covering with aflask for the drag side, packing said box pattern, the interstices ofsaid gate pattern and said drag flask with sand, inverting the parts,cutting a sprue, withdrawing the patterns to expose the male sand mold;laying a flask for the copeside upon a follow board. which carries ablock pattern and surmounted gate pattern so that said flask enclosessaid patterns, filling said copeflask with sand, cutting a sprue,inverting, drawing the patterns, covering the dra supported mold withthe cope supporte cavity and introducing molten metal to all of saidsprues.

15. The method of casting a slip jacket which consists in laying a gatepattern across the top of an open box pattern, covering with a flask forthe drag side, packing opposite sides of said'gate pattern with sand,separating said box pattern and flask, removingi said gate pattern,restoring said box pattern and gate pattern to juxtaposi tion, invertingthe parts, cutting a sprue through the male sand mold, lifting the boxpattern from the latter, surmounting a larger female mold over said malemold, cutting a sprue through said female mold so that it will registerwith said first mentioned sprue and introducing molten metal throughsaid sprues to reach and be distributed through said gates.

16. A cast metal slip jacket provided with wooden handles having amortise 'andtenon connection with said jacket, said connectionsextending horizontally along opposite sides of said jacket.

17. The method of making a slip jacket which consists in bringing maleand female sand portions into juxtaposition with the former intersectingthe latter so that a pas- 10 around said male sand portion, providingcommunicating sprues in both sand portions and causing molten metal toflow from one sprue across the top and down around said male sandportion and from the other sprue across the bottom and up around saidmale sand portion.-

Signed by me, this 13th day of January, 1920.

EDWARD P. ROTHACKER.

